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Well, I would expect a player who bid 2♦ in that auction to have a simple raise, unless they were playing inverted minor raises, and that those were still on after a double.
Well, that's interesting and all, but it's hardly required that they play what you expect.
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This responder has considerably more than a simple raise. If "fit showing, not forcing" is really their agreement, then responder misbid.
Eh, he took a position. Assuming that he knew what the X meant (maybe he'd played them before), he devalued his hand a bit for all of his points being in their suit, and while it was still stronger than a "simple raise" (whatever that means), it was probably intended to be non-forcing. It takes a LOT of points to make 5 of a minor, and 3 hcp over 3 suits is not a good sign for 3NT.
I'm not sure what you expected the opponents to say. "It shows diamonds, and it's not forcing if and only if across a weak balanced hand. No, I mean it. Really. Listen to what I'm saying. Forget your expectations. This is what it means. Honest". I assume that the explanation was exactly correct. This bid was on the high end. We don't know what bid is on the low end...maybe a 4-1-5-3 7 count.
I have the same problem. We play non-forcing two over 1, Precision. So, playing Match Points I open 1 spade, and partner bids 2 clubs. I alert. When asked, I say:
"Natural and invitational, should have at least 5 clubs and fewer than 3 spades".
If they ask about HCP, I say
"Usually 8 to 11, but based primarily on wanting to be in two clubs across a minimum balanced hand and wanting to be in game across a maximum balanced hand".
So we end up at 3NT or something, and my partner puts down some monster like:
x
xx
AQxx
AQTxxx
And they whine about how that's not invitational. "Well, would you want to be in 3NT across an 11 count 5332?" Probably not, they say. "So, what did you want me to say? Across a balanced max, it wants to be in 3NT or 5 clubs. Across a balanced minimum, we'd be in 2 clubs. How can I change my explanation to get that across?"
So, how can I? Or how can they?